﻿/*
 * MIT License
 *
 * Copyright (c) 2018 Clark Yang
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of 
 * this software and associated documentation files (the "Software"), to deal in 
 * the Software without restriction, including without limitation the rights to 
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 
 * of the Software, and to permit persons to whom the Software is furnished to do so, 
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all 
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
 * SOFTWARE.
 */

using System.Threading.Tasks;

namespace Loxodon.Framework.Interactivity
{
    public abstract class AsyncInteractionActionBase<TNotification> : IInteractionAction
    {
        public void OnRequest(object sender, InteractionEventArgs args)
        {
            AsyncInteractionEventArgs asyncArgs = args as AsyncInteractionEventArgs;
            TaskCompletionSource<object> source = asyncArgs.Source;
            TNotification notification = (TNotification)asyncArgs.Context;
            this.Action(notification).ContinueWith((t) =>
            {
                if (t.IsFaulted)
                    source.TrySetException(t.Exception);
                else if (t.IsCanceled)
                    source.TrySetCanceled();
                else
                    source.TrySetResult(null);
            }, TaskContinuationOptions.ExecuteSynchronously);
        }

        public abstract Task Action(TNotification notification);
    }

    public abstract class AsyncInteractionActionBase : IInteractionAction
    {
        public void OnRequest(object sender, InteractionEventArgs args)
        {
            AsyncInteractionEventArgs asyncArgs = args as AsyncInteractionEventArgs;
            TaskCompletionSource<object> source = asyncArgs.Source;
            this.Action().ContinueWith((t) =>
            {
                if (t.IsFaulted)
                    source.TrySetException(t.Exception);
                else if (t.IsCanceled)
                    source.TrySetCanceled();
                else
                    source.TrySetResult(null);
            }, TaskContinuationOptions.ExecuteSynchronously);
        }

        public abstract Task Action();
    }
}
